The first paper, written in Norwegian, was published in Forhandlinger i Videnskabs-selskabet i Christiania, 1864. The second work, written in French, was published by the authors in 1867. The third part, written in German, was published in Erdmann's Journal für practische Chemie, Bd. 127, 1879, and at the same time in Norwegian, in the "Forhandlinger".
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